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Re: Byte shift in IDL [message #2355]

Wed, 29 June 1994 08:18

landers
Messages: 45
Registered: May 1993

Member

In article <2urg4sINN9rv@maz4.sma.ch>, oet@sma.ch (Thomas Oettli) writes:
|> I should translate the following C Code fragment to IDL:

|> unsigned long var;

There are no unsigned longs in IDL/WAVE, but no matter.

|> fread(&var, 1, 1, in_fp);

b = 0B ; declare one byte
readu, lun, b ; read one byte

|> var >>= 24; /* shift var to lowest byte */
(assuming sizeof(long) == 4)

var = long( b ) ; convert to long

I think this should do what you're after, that is read one byte from a
file and put it into the lower bits of a long.

If you want to do bit shifting, use the ISHIFT function.

;Dave

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